The attachment of large files to Outlook fails because of server errors

Question

Hi team,

We have to upload files that are between 3MB and 150MB in size. We followed the Microsoft documentation for large files, but we encountered two frequent errors. We are not sure about the exact size limit that causes the API to return errors, but we noticed that the first file of about 70MB or less can be uploaded without any problem. Sometimes, we get errors when we try to upload a second file or a first file that is around 100MB or more. These are the common errors that we always face:
Error 1 - {"code":"ApplicationThrottled","message":"Application is over its IncomingBytes limit."}

Error 2 - {"code":"ErrorIrresolvableConflict","message":"The send or update operation could not be performed because the change key passed in the request does not match the current change key for the item."} We tried the solution from this StackOverflow discussion and added 100 milliseconds delays between API calls. But we still get errors.

Links which discussed about this topic

1. https://powerusers.microsoft.com/t5/General-Power-Automate/Send-or-update-operation-could-not-be-performed-when-flow/td-p/638602
2. https://stackoverflow.com/questions/43105115/outlook-api-receiving-errorirresolvableconflict-when-trying-to-send-draft Thanks in advance.